Possible Causes: Infectious Agents
Due in part to its similarity to chronic mononucleosis, CFS was initially thought to be caused by a virus infection, most probably Epstein-Barr virus (EBV).
It now seems clear that CFS cannot be caused exclusively by EBV or by any single recognized infectious disease agent. No firm association between infection with any known human pathogen and CFS has been established.
CDC's four-city surveillance study found no association between CFS and infection by a wide variety of human pathogens, including EBV, human retroviruses, human herpesvirus 6, enteroviruses, rubella, Candida albicans, and more recently bornaviruses and Mycoplasma.
Taken together, these studies suggest that among identified human pathogens, there appears to be no causal relationship for CFS. However, the possibility remains that CFS may have multiple causes leading to a common endpoint, in which case some viruses or other infectious agents might have a contributory role for a subset of CFS cases.
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